CN201457068U - Gear positioning mechanism for power takeoff device - Google Patents
Gear positioning mechanism for power takeoff device Download PDFInfo
- Publication number
- CN201457068U CN201457068U CN2009201047777U CN200920104777U CN201457068U CN 201457068 U CN201457068 U CN 201457068U CN 2009201047777 U CN2009201047777 U CN 2009201047777U CN 200920104777 U CN200920104777 U CN 200920104777U CN 201457068 U CN201457068 U CN 201457068U
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- CN
- China
- Prior art keywords
- gear
- gearshift axle
- shift fork
- housing
- power takeoff
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model belongs to the field of power takeoff devices for special vehicles, and particularly relates to a gear positioning mechanism for a power takeoff device. The gear positioning mechanism comprises a gear shifting shaft and a shifting fork, wherein the gear shifting shaft can be mounted in a casing in a sliding manner and in the axial direction; the shifting fork is provided with a boss part and can be supported on the gear shifting shaft in a sliding manner; the boss part can slide in the axial direction; the movement range of the boss part is limited by the step parts and retainer rings which are arranged on the gear shifting shaft at intervals; a tapped hole with the diameter larger than that of the retainer ring is formed on the casing; a spiral pin used for positioning is mounted in the tapped hole; a self-locking ball and a spring are accommodated in the spiral pin in the axial direction; the self-locking balls are buckled in the concave parts used for positioning and formed at set intervals in the axial direction on the outer peripheral surface of the boss part; and the spring keeps suppressing the self-locking balls in the buckling direction. Therefore, the gear positioning mechanism does not need to cut the casing and can easily ensure the accuracy of the sizes of the casing and the shifting fork.
Description
Technical field
The utility model belongs to the power takeoff field in the special vehicle such as dumping car, specifically belongs in a kind of power takeoff by with the engagement of driven wheel or separate and carry out being connected and open circuited output gear detent mechanism of power.
Background technology
Existing this type gear detent mechanism, belong to the mechanism that between shift fork that output gear is slided along axis direction and housing, adopts self-locking device to position, for example, adopt independent operating system independent operation, carry out the power clutch of Hydraulic Pump and the mechanism that the direction transformation valve switches respectively.Just, by being installed in the slip of the shift fork on the gearshift axle, make the gear of drive-system realize engagement or separation.Thereby make hydraulic pump drive or stop, the conversion modulated pressure pump output hydraulic oil by change-over valve flows and stops simultaneously.
Wherein the detent mechanism of shift fork constitutes, on the top that is embedded in the shift fork boss portion on the exchanging shaft, be provided with the through hole that outside in connects, in this through hole, be inserted with the diameter ball bigger than the wall thickness of boss portion, generally, this ball is sticked in the arc-shaped slot that forms on the exchanging shaft, shift fork and exchanging shaft one are moved, shift fork moves to when making output gear and drive-system gear carry out position engaged with shift shaft, described ball is corresponding with the breach on the housing that is arranged at power takeoff, when gearshift axle is crossed this breach and is moved further, thereby described ball is deviate from and is sticked in the breach side to make shift fork remain on housing one side from the arc groove of gearshift axle.
In addition, the switching of the engagement of above-mentioned power takeoff middle gear, separation and Hydraulic Pump is separately carried out.The engagement of change gear in two steps only is fixed on the gearshift axle with the shift fork card that separates.The engagement of output gear, disengaged position determine to pass through detent mechanism.This detent mechanism is by from lock ball with this is constituted at the spring that is pressed in recess at ordinary times from lock ball.Should be arranged on that the power that forms on the boss portion of shift fork of case side of power takeoff connects and two recesses disconnecting usefulness engage, break away from from lock ball.
Yet, in above-mentioned existing apparatus, have following shortcoming.At first, in order to ensure the dimensional accuracy of housing and shift fork and for installing and locating on housing use from lock ball, its housing must be divided into two parts up and down.Secondly, when housing is made as two parts, must carry out high precision and sealing surface processing and screw processing etc. on a large scale for its division plane, its processing operation is very loaded down with trivial details.And the housing partitioning scheme must be provided with leakproofing material and be used for a plurality of bolts of housing combination, brings the problem that number of parts is increased.
Summary of the invention
For addressing the above problem, the purpose of this utility model provides a kind of gear detent mechanism of power takeoff, the dimensional accuracy that it does not need to cut apart housing and reaches housing and shift fork easily.
The utility model is achieved by the following technical programs
A kind of gear detent mechanism of power takeoff, it comprises gearshift axle and shift fork, and described gearshift axle can be installed in the housing vertically slidably, and described shift fork has boss portion and can be bearing in slidably on the described gearshift axle; Described boss portion can be slided vertically, and limits its moving range by stage portion and the back-up ring that is provided with that keep at a certain distance away on the gearshift axle; On housing, offer the tapped bore bigger, the location spiral pin is installed in this tapped bore than back-up ring diameter; Contain the self-locking ball and spring in this spiral pin vertically, the location that is fastened on the outer peripheral face upper edge axially spaced-apart predetermined distance formation of described boss portion from lock ball is used in the recess, and described spring always keeps compacting state from lock ball along the engaging direction to described.
Advantage of the present utility model is:
Because having the location that will contain the self-locking ball and spring via tapped bore, it is installed on structure on the housing with spiral pin, so can guarantee the dimensional accuracy of shift fork and spiral pin by the installation of tapped bore, in addition, because the restriction by step and back-up ring can make shift fork and gearshift axle one move, from the spiral pin mounting hole is that the tapped bore insertion can be installed in back-up ring on the gearshift axle, does not therefore need housing is cut apart.
Description of drawings
Fig. 1 is the elevating ram drive system scheme drawing of dumping car;
Fig. 2 is the gear detent mechanism transmission of power section-drawing of the utility model power takeoff;
Fig. 3 is the scheme drawing that detent mechanism shown in Figure 2 keeps the power released state when making change-over valve to lowering position;
Fig. 4 is the scheme drawing that detent mechanism shown in Figure 2 keeps the power released state when making change-over valve to center position;
Fig. 5 is the scheme drawing that detent mechanism shown in Figure 2 becomes the power coupled condition when making change-over valve to hoisting position;
Fig. 6 is the scheme drawing that detent mechanism shown in Figure 2 keeps the power coupled condition when making change-over valve to center position.
The explanation of symbol among the figure:
1, power takeoff; 2, Hydraulic Pump; 3, change-over valve; 4, power drive; 5, joystick; 6, fuel tank; 7, elevating ram; 8, housing; 9, output shaft; 10, spline; 11, output gear; 12, intermediate gear; 13, drive side cog wheel of the oil pump; 14, slave end cog wheel of the oil pump; 15, oil pump case; 16, driven shaft; 17, gearshift axle; 18, hawser; 19, step; 20, back-up ring; 21, shift fork; 22, boss portion; 23, circular groove; 24, tapped bore; 24-1, mount pad; 25, spiral pin; 25-1, circular hole; 26, from lock ball; 27, spring; 28, plug screw; 29,30 recesses; 31, pad; 32, O type circle.
The specific embodiment
Below, referring to accompanying drawing the utility model is elaborated.
Fig. 1 is the elevating ram drive system figure of dumping car.
Referring to Fig. 1, dumping car elevating ram drive system comprises power takeoff 1, Hydraulic Pump 2, change-over valve 3, power drive 4, joystick 5, hawser 18, fuel tank 6 and elevating ram 7.Wherein, lifting by the joystick 5 control change-over valves 3 control elevating rams 7 of operative configuration in operator's compartment, simultaneously joystick 5 is connected with power takeoff 1 by hawser 18, thereby the power of synchronously controlling 1 pair of this power drive 4 of power takeoff connects with the driving that disconnects modulated pressure pump 2 and stops.
Fig. 2 is the gear detent mechanism transmission of power section-drawing of the utility model power takeoff, Fig. 3 is the scheme drawing that detent mechanism shown in Figure 2 keeps the power released state, and Fig. 4 is the scheme drawing that detent mechanism shown in Figure 2 keeps the power released state when making change-over valve to center position.
With reference to Fig. 2, Fig. 3, in the utility model, what use as Hydraulic Pump 2 is gear type pump, only shows its part among the figure, and omitted the detailed structure of change over valve 3 that but, what this valve used is three plunger valves.
Central part at the housing 8 of power takeoff can be supported with output shaft 9 rotatably.Be used for to be entrenched in slidably on the spline 10 that is formed on this output shaft 9 by carrying out the output gear 11 that power takes out with intermediate gear 12 engagements.Intermediate gear 12 is in the constant-mesh state with the power taking-up gear of torque transfer 4, and it keeps often rotation when engine running.An end, slave end cog wheel of the oil pump 14 that the drive side cog wheel of the oil pump 13 of gear type pump 2 is fixed on output shaft 9 are fixed on the driven shaft 16, and driven shaft 16 can be bearing on the oil pump case 15 rotatably.
On top, gearshift axle 17 can be installed slidably vertically near housing 8.These gearshift axle 17 one ends are connected with above-mentioned joystick 5 via hawser 18 (perhaps connecting rod mechanism), have three switching positions.As Fig. 1, shown in Figure 2, plunger valve oil cylinder 7 when midway location is in center position (oil cylinder interface locked position of coupler), when gearshift axle 17 is mobile to the right from this center position, make elevating ram 7 switch to lift location, when gearshift axle 17 is mobile to the left from this center position, make elevating ram 7 switch to lowering position.
Can the chimeric slidably vertically boss portion 22 that shift fork 21 is arranged on the described gearshift axle 17.Two personal share portions of this shift fork 21 are sticked in the annular groove 23 that forms on the outer peripheral face of the boss portion of output gear 11, move with gearshift axle 17, output gear 11 is meshed with intermediate gear 12 or separate.And, on gearshift axle 17, form the boss portion 22 of the above-mentioned shift fork 21 of clamping and towards the stage portion 19 on right side.In graphic left side back-up ring 20 is installed, and the interval between stage portion 19 and the back-up ring 20 is made as bigger than the width (axial length) of boss portion 22.
In specialized range, allow shift fork 21 to move relative to gearshift axle 17 by stage portion 19 and back-up ring 20 controls.This rate of travel is equivalent to the transformed distances of a gear of above-mentioned change over valve 3, that is, and and from the center position to the lift location or to the converted quantity of lowering position.Therefore, the converted quantities that shift fork 21 surpasses a step of change over valve 3 at gearshift axle 17 carry out when mobile,, perhaps move by the right side one of back-up ring 20 in figure to the left side shown in the figure by 19 ones on step.
Referring to Fig. 2 and Fig. 3, keep the gear detent mechanism of engage position or disengaged position to describe with respect to intermediate gear 12 to being used for output gear 11.This gear detent mechanism is made of self-locking mechanism, is installed in the top of above-mentioned housing 8 as shown in the figure.
Be formed with tapped bore 24 on the top of housing 8, spiral pin 25 connects these tapped bore 24, insert the boss portion 22 that is fixed on above-mentioned shift fork 21 above.On this spiral pin 25, form concentric circle holes 25-1 at least at an upper portion thereof with negative thread, and, contain in this circular hole 25-1 from lock ball 26 and should be from the downward pressure-formed spring 27 of lock ball, the plug screw 28 that is fixed on the top of circular hole 25-1 by insertion is fixed them.
Outer upper in the boss portion 22 of shift fork 21 forms a plane, simultaneously this upper edge, plane axially spaced-apart certain distance form determine the power connection location with and determine two dish- shaped recesses 29,30 that the power disengaged position is used, above-mentionedly in recess 29,30, select one of them to engage from lock ball 26.
And the top of above-mentioned tapped bore 24 processes the mount pad 24-1 of spiral pin 25, thus, can guarantee the dimensional accuracy of this spiral pin 25 and shift fork 21, and promptly the gap between the last plane of the upper end of spiral pin 25 and shift fork 21 is suitable.On mount pad 24-1, can be adjusted into suitable gap by plus-minus packing ring 31.The relative mount pad 24-1 in the top of spiral pin 25 utilizes O type circle 32 to seal.
In the utility model, because the mounting hole of spiral pin 25 is the tapped bore 24 double installation exercise auxiliary holes of doing when being installed in above-mentioned back-up ring 20 on the gearshift axle 17, so its diameter is set at, and the diameter than back-up ring 20 is big at least.And, as shown in the figure, under the state that shift fork 21 is embedded on the gearshift axle 17, back-up ring 20 is inserted from tapped bore 24 before spiral pin 25 is installed, and be pressed into and be installed in the fastening groove of offering in the gearshift spools 17 by adopting proper implements.
Be structure of the present utility model as mentioned above, the following describes its working process.
Fig. 3 axle of representing to shift gears is shifted to the state of the leftmost side, and output gear 11 remains on the position that is separated with intermediate gear, and change over valve 3 transforms to the position that elevating ram 7 is descended.At this moment, back-up ring 20 leaves the boss portion 22 of shift fork 21.Under this state, if use joystick 5 that gearshift axle 17 is moved to the right, then change over valve 3 transforms to center position, as shown in Figure 3, remain on the power disengaged position from lock ball 26 in the recess 30 that the shift fork 21 of this moment is used by the disengaged position that is fastened on diagram right side shown in Figure 4 always, become the state that back-up ring 20 and boss portion 22 connect.
Fig. 5 is the scheme drawing of the utility model detent mechanism in the power coupled condition.
Referring to Fig. 5, under the state of Fig. 4, when gearshift axle 17 was further mobile to the right, shift fork 21 was deviate from gearshift axle 17 recess of using from the power disengaged position from lock ball 26 30 and is moved by back-up ring 20 compactings.And, move by this output gear shown in Figure 5 11 is slided and the intermediate gear engagement along the spline of output shaft 9, thus outputting power.That is to say, form, make output shaft 9 rotation and driving gear pump 2 via output gear 11, this moment in lock ball 26 is sticked in the recess 29 that the power connection location uses, remain on the power coupled condition.In driving gear pump, change over valve 3 transforms to the position that oil cylinder 7 is risen, and the hydraulic oil of gear type pump 2 outputs is carried to elevating ram 7, makes this elevating ram 7 elongations.
Fig. 6 is the scheme drawing that detent mechanism shown in Figure 2 keeps the power coupled condition when making change-over valve to center position.
In state shown in Figure 5, when gearshift axle 17 was mobile to the left, change over valve 3 was got back to center position.At this moment, shift fork 21 remains on the power coupled condition by the recess 29 that is sticked in the power connection location and uses from lock ball 26.The stage portion 19 of gearshift axle 17 shown in Figure 5 becomes the state that the boss portion 22 with shift fork 21 connects.At this moment, the hydraulic oil that gear type pump 2 is exported is directly got back in the fuel tank 6, and elevating ram 7 is in blocking.
When further mobile to the left, shift fork 21 is pressed by the stage portion 19 of gearshift axle 17, the recess of using from the power connection location from lock ball 26 29 is deviate from gearshift axle 17 moved from the state of Fig. 6 for gearshift axle 17.Thereby by this move make output gear 11 along output shaft 9 slide and the intermediate gear engagement separated, get back to power shown in Figure 3 and separate the out-of-work state of oil pump.Change over valve 3 transforms to the position that elevating ram 7 is descended simultaneously, and the hydraulic oil in the elevating ram 7 returns fuel tank 6 and shortens.
In a word, in structure of the present utility model, not only accommodate from the spiral pin 25 of lock ball 26 and spring 27 and install via tapped bore 24, and, can guarantee the dimensional accuracy of shift fork 21 and spiral pin 25 by the mount pad 24-1 of spring eye 24.In addition,, and utilize the tapped bore 24 that spiral pin 25 is installed to realize back-up ring 20 installation of gearshift axle 17 relatively, thus, no longer need housing 8 is cut apart because mode is by stage portion 19 and back-up ring 20 shift fork 21 and gearshift axle 17 one to be moved.
Effect of the present utility model
As mentioned above, the utility model no longer needs to cut apart the housing of power takeoff, therefore, in the time of can avoiding cutting apart housing its divisional plane requisite high accuracy and the on a large scale processing operation of the trouble such as sealing surface processing and screw thread processing. Even relative housing must be useful on hole processing and the mount pad processing that spiral pin is installed in the utility model, implementing in full processing when being divided into two parts with housing, to compare only be to finish processing in the part, its processing also is very easy to, and dimensional accuracy also reaches easily, compare with the housing partitioning scheme, its number of components also can reduce. Have again, according to the utility model, can change from lock ball and spring by the dismounting spiral pin when user needs, therefore, can improve significantly the maintenance activity of gear positioning mechanism.
Claims (1)
1. the gear detent mechanism of a power takeoff, it is characterized in that, it comprises gearshift axle (17) and shift fork (21), described gearshift axle (17) can be installed in the housing (8) vertically slidably, and described shift fork (21) has boss portion (22) and can be bearing in slidably on the described gearshift axle (17); Described boss portion (22) can be slided vertically, and goes up the stage portion (19) and the back-up ring (20) that are provided with at interval by gearshift axle (17) and limit its moving range; On housing (8), offer the tapped bore (24) bigger, location spiral pin (25) is installed in described tapped bore (24) than back-up ring (20) diameter; Contain vertically in the described spiral pin (25) from lock ball (26) and spring (27), described from lock ball (26) be fastened on location that the outer peripheral face upper edge axially spaced-apart predetermined distance of described boss portion (20) forms with recess (29), (30) in, described spring (27) always keeps compacting state from lock ball (26) along the engaging direction to described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201047777U CN201457068U (en) | 2009-09-09 | 2009-09-09 | Gear positioning mechanism for power takeoff device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201047777U CN201457068U (en) | 2009-09-09 | 2009-09-09 | Gear positioning mechanism for power takeoff device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201457068U true CN201457068U (en) | 2010-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201047777U Expired - Fee Related CN201457068U (en) | 2009-09-09 | 2009-09-09 | Gear positioning mechanism for power takeoff device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201457068U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102674179A (en) * | 2012-05-21 | 2012-09-19 | 安徽省宿州市龙华机械制造有限公司 | Device of double-speed gear box on endless rope winch for preventing planetary gear rack from axially deviating |
| CN102927267A (en) * | 2012-11-01 | 2013-02-13 | 唐海滨 | Gear self-locking device of mechanical automatic gearbox of electric motor coach |
| CN103939595A (en) * | 2014-04-11 | 2014-07-23 | 苏州紫荆清远新能源汽车技术有限公司 | Gear selecting and shifting execution mechanism of automatic transmission of wide vehicle |
| CN110487566A (en) * | 2019-09-12 | 2019-11-22 | 湖北中航精机科技有限公司 | Bulb ejector pin device and shift fork detector |
-
2009
- 2009-09-09 CN CN2009201047777U patent/CN201457068U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102674179A (en) * | 2012-05-21 | 2012-09-19 | 安徽省宿州市龙华机械制造有限公司 | Device of double-speed gear box on endless rope winch for preventing planetary gear rack from axially deviating |
| CN102674179B (en) * | 2012-05-21 | 2015-04-15 | 安徽省宿州市龙华机械制造有限公司 | Device of double-speed gear box on endless rope winch for preventing planetary gear rack from axially deviating |
| CN102927267A (en) * | 2012-11-01 | 2013-02-13 | 唐海滨 | Gear self-locking device of mechanical automatic gearbox of electric motor coach |
| CN103939595A (en) * | 2014-04-11 | 2014-07-23 | 苏州紫荆清远新能源汽车技术有限公司 | Gear selecting and shifting execution mechanism of automatic transmission of wide vehicle |
| CN103939595B (en) * | 2014-04-11 | 2016-02-10 | 苏州紫荆清远新能源汽车技术有限公司 | A kind of expanded letter car shift-selecting and changing actuating mechanism for automatic speed transmission |
| CN110487566A (en) * | 2019-09-12 | 2019-11-22 | 湖北中航精机科技有限公司 | Bulb ejector pin device and shift fork detector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100512 Termination date: 20100909 |